ACL
| Atlantic Coast Line | 1 |
AMTK
| Amtrak | 2 |
ATSF
| Atchison Topeka & Santa Fe | 3 |
AWP
| Atlanta & West Point | 1 |
BN
| Burlington Northern | 105 |
BNX
| BNX | 2 |
BO
| Baltimore & Ohio | 1 |
CBQ
| Chicago Burlington & Quincy | 97 |
CNW
| Chicago & Northwestern | 5 |
CO
| Chesapeake & Ohio | 3 |
CRIP
| Chicago Rock Island & Pacific | 1 |
CS
| Colorado & Southern | 2 |
DRGW
| Denver & Rio Grande Western | 1 |
GMO
| Gulf Mobile & Ohio | 1 |
GN
| Great Northern | 2 |
IC
| Illinois Central | 2 |
ICG
| Illinois Central Gulf | 1 |
LN
| Louisville & Nashville | 11 |
MEC
| Maine Central | 2 |
MILW
| Milwaukee Road | 10 |
MP
| Missouri Pacific | 20 |
NALX
| Nalco Chemical Co | 1 |
RI
| RI | 1 |
RMC
| RMC | 1 |
SBD
| Seaboard System | 3 |
SCL
| Seaboard Coast Line | 2 |
SOO
| Soo Line | 4 |
SOU
| Southern | 4 |
SP
| Southern Pacific | 2 |
SPS
| Spokane Portland & Seattle | 1 |
UP
| Union Pacific Railroad Company | 7 |